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Predicate expand_phrase/2
 expand_phrase(+PhraseGoal, -Goal) is semidet
 expand_phrase(+PhraseGoal, +Pos0, -Goal, -Pos) is semidet
Provide goal-expansion for PhraseGoal. PhraseGoal is either phrase/2,3 or call_dcg/2,3. The current version does not translate control structures, but only simple terminals and non-terminals.

For example:

?- expand_phrase(phrase(("ab", rule)), List), Goal).
Goal = (List=[97, 98|_G121], rule(_G121, [])).
throws
- Re-throws errors from dcg_translate_rule/2
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